ILLINOIS NATURAL HISTORY SURVEY 



Bulletin 



Volume 27, Article 2 

 December, 1958 



Printed by Authority of 

 the State of Illinois 



A Century of 

 Biological Research 



HARLOW B. MILLS 

 GEORGE C. DECKER 

 HERBERT H. ROSS 

 J. CEDRIC CARTER 



GEORGE W. BENNETT 

 THOMAS G. SCOTT 

 JAMES S. AYARS 

 RUTH R. \YARRICK 



BESSIE B. EAST 



STATE OF ILLINOIS* William G. Stratton, Governor 



DEPARTMENT OF REGISTRATION AND EDUCATION • Vera M. Binks, Director 



NATURAL HISTORY SURVEY DIVISION • Harlow B. Mills, Chief 



Urbana 



Illii 



